Time reversal may refer to:
- In physics, T-symmetry - the study of thermodynamics and the symmetry of certain physical laws where the concept of time is reversed — i.e. where a mirror (reverse) transformation is applied to a forward direction time state.
- Time Reversal Signal Processing, a signal processing technique popular in acoustics, and currently being applied to electromagnetics, that results from the reversal in time of a system's response signal
- Time travel, theorised and speculative concepts about travelling physically through time
Famous quotes containing the words time and/or reversal:
“My chair was nearest to the fire
In every company
That talked of love or politics,
Ere Time transfigured me.”
—William Butler Yeats (1865–1939)
“Perversity depends on reversal and substitution.”
—Mason Cooley (b. 1927)